Dynamic Temperature Calculation Model for Winding Area of Dry-type Vehicle Mounted Traction Transformer

The dry type vehicle mounted traction transformer, despite light weight and high safety factor, features frequently fluctuating internal thermal field with the operating environment and load status. To achieve rapid calculation of the dynamic temperature of the windings of dry-type vehicle mounted traction transformers, by constructing a distributed dynamic thermal network topology based on the principle of thermoelectric analogy, this paper conducted a series of simulation experiments using CFD models to explore the effects of operating parameters and duct size on heat dissipation performance. A calculation method was proposed for duct outlet temperature. Finally, the effectiveness of the dynamic temperature calculation model was verified based on the temperature rise test platform of the winding of the dry-type vehicle mounted traction transformer. The results show that for different structural parameters and time-varying operating scenarios, the established dynamic temperature calculation model of the winding can accurately obtain the temperature distribution and dynamic changes in the winding area. Compared with CFD numerical simulation, the model saves more than 99% of the time cost, and is helpful for the reasonable planning of the thermal capacity of dry vehicle traction transformers and further improving the design efficiency. © 2024 Science Press. All rights reserved.